RJ9 (4P4C) to 3.5mm Stereo plug frame
thingiverse
We needed a handset jack (RJ9 4P4C) to 3.5 mm stereo plug. Superglue & crimp the sleeve on the 3.5 mm plug, solder connections, heatshrink tubing solidifies the mechanical connection. Updated for a second installation at another division: Rounded over edges, reshaped plug mounting peg, and a trough under the RJ9 and relocated wire exit all make for a cleaner look. Version 2.1 is the first rendered view above. The first version is used in the assembly photos. Warning: If you're salvaging old Nitsuko 124i/384i handsets, check the wiring of the RJ9. They do not conform to standard wiring colors or pinouts.
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